421715709 has 24 divisors (see below), whose sum is σ = 645535800. Its totient is φ = 264821760.

The previous prime is 421715687. The next prime is 421715747. The reversal of 421715709 is 907517124.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 8732025 + 412983684 = 2955^2 + 20322^2 .

It is not a de Polignac number, because 421715709 - 2⁸ = 421715453 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421715009) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9004 + ... + 30405.

It is an arithmetic number, because the mean of its divisors is an integer number (26897325).

Almost surely, 2^421715709 is an apocalyptic number.

It is an amenable number.

421715709 is a deficient number, since it is larger than the sum of its proper divisors (223820091).

421715709 is a wasteful number, since it uses less digits than its factorization.

421715709 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39485 (or 39482 counting only the distinct ones).

The product of its (nonzero) digits is 17640, while the sum is 36.

The square root of 421715709 is about 20535.7178837264. The cubic root of 421715709 is about 749.9055934504.

The spelling of 421715709 in words is "four hundred twenty-one million, seven hundred fifteen thousand, seven hundred nine".